David Walsh Blog

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    Get Worldwide Postal Code Data with Zip Code API

    Accurate shipping and location information is well worth the price you need to pay for it. You can sell that information, you can target consumers to perfection, and save yourself loads of frustration when it comes to shipping. Creating your own location API isn't worth the...

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    JavaScript in SVGs

    SVGs are such an amazing tool for creating custom fonts, animations, size-reduced graphics, and more. They're part HTML, part image, and all awesome. Many websites have moved toward SVG instead of JPG, GIF, and PNG due to the flexibility that SVG provides.Whats one example...

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    CSS background-repeat: round

    The CSS spec is full of gems that sneak their way past most of us web designers and developers. Stuff like :focus-within, prefers-reduced-motion, and prefers-color-scheme suddenly make their way into CSS without us really finding out for months or years. One such...

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    Kotlin Coroutines and Delay

    Whenever I suspect that there's a timing conflict causing a problem with rendering and directives, I usually opt for a JavaScript setTimeout with a delay. The setTimeout code never makes it to production, but it does help me to understand if my code is the...

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    3 Great Ways to Monetize Content

    Monetizing content on the web usually boils down to one thing: advertisements. The problem with adding advertisements to your website, especially from the popular ad services, is that they can be slow and they certainly don't protect user privacy. That's where alternative monetizing opportunities come into...

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    Are You a Developer?

    “You’re not really a developer. Sooner or later people are going to realize you don’t know what you’re talking about. You’re just not good enough.”You’ve probably had thoughts like these at one point or another. You’ve never heard someone else tell you that you’re not a...

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    Devising the Cloak of Invisibility in JavaScript

    Steganography. The art of hiding something right under your nose. For as long as humans have been alive, we’ve been trying to hide things — whether it’s our last slice of pizza or the location of a buried treasure. Do you remember the cool invisible lemon...

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    Offscreen Text for Copy & Paste

    The relationship between HTML and CSS is special: mixing content via HTML with presentation from CSS to make an awesome presentation. Sometimes, however, you need to employ CSS tricks solely to enhance functionality. This could be one of those cases.When browsing through the Firefox...

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    Unlock Your Mac with Apple Watch

    I convinced myself six months ago that I needed to give the Apple Watch a try. While I wear it every day and enjoy a few features, I've felt a bit let down by the experience. I do, however, believe that the Apple Watch...

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    Free SSL Certificates with ZeroSSL

    During my early years in web development, one of the most costly and annoying tasks was securing and installing security certificates on client websites. Most providers charged hundreds of dollars for SSL certs and getting them configured properly was a huge source of stress. Securing...

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    Interview with a Pornhub Web Developer

    Regardless of your stance on pornography, it would be impossible to deny the massive impact the adult website industry has had on pushing the web forward. From pushing the browser's video limits to pushing ads through WebSocket so ad blockers don't detect them, you have...

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    Welcome to My New Office

    My first professional web development was at a small print shop where I sat in a windowless cubical all day. I suffered that boxed in environment for almost five years before I was able to find a remote job where I worked from home. The first...

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    How to Create a RetroPie on Raspberry Pi – Graphical Guide

    Today we get to play amazing games on our super powered game consoles, PCs, VR headsets, and even mobile devices.  While I enjoy playing new games these days, I do long for the retro gaming systems I had when I was a kid: the original Nintendo...

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    Conquering Impostor Syndrome

    Two years ago I documented my struggles with Imposter Syndrome and the response was immense.  I received messages of support and commiseration from new web developers, veteran engineers, and even persons of all experience levels in other professions.  I've even caught myself reading the post...

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    Being a Dev Dad

    I get asked loads of questions every day but I'm always surprised that they're rarely questions about code or even tech -- many of the questions I get are more about non-dev stuff like what my office is like, what software I use, and oftentimes...

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    JavaScript Promise API

    While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why "hold up the show" when you can trigger numerous requests at once and then handle them when each is ready?  Promises are becoming a big part of the JavaScript world...

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    7 Essential JavaScript Functions

    I remember the early days of JavaScript where you needed a simple function for just about everything because the browser vendors implemented features differently, and not just edge features, basic features, like addEventListener and attachEvent.  Times have changed but there are still a few functions each developer should...